ENG 1 & 2 Pump Switch & Light

• Switch
  • ON - The Pump Pressurizes the system when the Engine is running.
  • OFF - The Pump is depressurized. Power generation stops.
• Light - Illuminates amber to indicate:
  • Reservoir low level
  • Reservoir overheat
  • Reservoir low air pressure
  • Pump low pressure
  Extinguishes when the ENG PUMP switch is selected OFF, except during an overheat; in which case, the light remains on as long as the overheat is present.

ENG 1 & 2 L/R TK Pumps Switch & Fault Lights

• Switch
  • ON - Energize associated Tank Pump; fuel feeds only when center Tank Pumps' delivery pressure drops below threshold.
  • OFF - Deactivate associated Tank Pump.
• Fault Lights - Illuminates amber when the delivery pressure drops. Inhibited when OFF selected.

RAT MAN ON Switch ( Red Guard )
When pushed, the RAM Air Turbine extends.
The RAT extends automatically in flight with a loss of AC buses 1 and 2.

Blue ELEC Pump Switch & Fault Light ( Guarded )

• Switch
  • AUTO - The Pump is energized, provided AC power is available:
    • In flight
    • On the ground, provided one engine is running or the BLUE PUMP OVRD switch has been pressed.
  • OFF - The Pump is de-energized.
• Fault Light - Illuminates amber to indicate:
  • Reservoir low level
  • Reservoir overheat
  • Reservoir low air pressure
  • Pump low pressure
  Extinguishes when the BLUE ELEC PUMP switch is selected OFF, except during an overheat; in which case, the light remains on as long as the overheat is present.

PTU Switch & Fault Light

• Switch
  • AUTO - The reversible motor pump is armed and both yellow and green electro-hydraulic valves are open. The PTU runs automatically when the differential pressure between the green and yellow systems is more than 500 psi.
  • OFF - Both green and yellow PTU electro-hydraulic valves are energized and close. Power transfer stops.
• Fault Light - Illuminates amber to indicate:
  • Green or yellow reservoir overheat
  • Green or yellow reservoir low air pressure
  • Green or yellow reservoir low level
  Extinguishes when the PTU switch is selected OFF, except during an overheat; in which case, the light remains on as long as the overheat is present.

Yellow ELEC Pump & Fault Light

• Switch
  • ON - The Pump is energized. If electrical power is removed the pump remains de-energized at the next electrical power application.
  • OFF - The Pump is de-energized. It is automatically energized when the forward or aft cargo door lever is operated. During cargo door operation, all other yellow system users are inhibited, except for the No. 2 engine thrust reverser and the brake accumulator.
• Fault Light - Illuminates amber to indicate:
  • Reservoir low level
  • Reservoir overheat
  • Reservoir low air pressure
  • Pump low pressure
  Extinguishes when the YELLOW ELEC PUMP switch is selected OFF, except during an overheat; in which case, the light remains on as long as the overheat is present.

X FEED Switch & Open Light

• Switch
  • OFF - Closes Crossfeed valve.
  • ON - Open Crossfeed valve. ON illuminates white.
• Open Light - Illuminates green when Crossfeed valve is fully open.

CTR TK 1 & 2 Pump Switches & Fault Lights

• Switch
  • ON - Activates associated Center Tank Pump. If MAN mode is selected on MODE SEL switch.
  • OFF - Deactivate associated Center Tank Pump.
• Fault Lights - Illuminates amber when the associated Pump is operating and delivery pressure drops.

Mode SEL Switch & Fault Lights

• Switch
  • AUTO - Center Tank Pumps control is automatic:
    • Pumps operate at engine start for two minutes
    • Pumps operate provided slats are retracted
    • Pumps automatically turn off five minutes after Center Tank low level is reached
  • MAN - Allows manual control of Center Tank Pumps with CTR TK PUMP switches.
• Fault Lights - Illuminates amber when Center Tank has more than 550 pounds of fuel and the left or right wing Tank has less than 11,000 pounds.